The Anatomy of _Heptanchus maculatus_: the Endoskeleton, by J. [Please select]
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Endoskeleton: applied to those chitinous processes extending inward into the body cavity from the body wall and serving as attachments for muscles. [Please select]
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Skeleton: the hard chitinous parts which externally (exoskeleton) or internally (endoskeleton) form a protective covering, or serve as points of attachment, to muscles and other soft organs. [Please select]
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